<template>
	<div class="course-list">
		<el-card>
			<el-form
				ref="form"
				inline
				:model="filterParams"
			>
				<el-form-item label="课程名称" prop="courseName">
					<el-input v-model="filterParams.courseName"></el-input>
				</el-form-item>
				<el-form-item label="状态" prop="status">
					<el-select v-model="filterParams.status">
						<el-option label="全部" value=""></el-option>
						<el-option label="上架" value="1"></el-option>
						<el-option label="下架" value="0"></el-option>
					</el-select>
				</el-form-item>
				<el-form-item>
					<el-button type="primary" :disabled="loading" @click="handleFilter">查询</el-button>
					<el-button :disabled="loading" @click="handleReset">重置</el-button>
					<el-button type="success" @click="$router.push({ name: 'course-create' })">添加课程</el-button>
				</el-form-item>
			</el-form>
		
			<el-table
				border
				:data="courses"
				v-loading="loading"
				style="width: 100%; margin-bottom: 20px"
			>
				<el-table-column prop="id" label="ID"> </el-table-column>
				<el-table-column prop="courseName" label="课程名称"> </el-table-column>
				<el-table-column prop="price" label="价格"> </el-table-column>
				<el-table-column prop="sortNum" label="排序"> </el-table-column>
				<el-table-column prop="status" label="上架状态">
					<template slot-scope="scope">
						<el-switch
							v-model="scope.row.status"
							active-color="#13ce66"
							inactive-color="#ff4949"
							:active-value="1"
							:inactive-value="0"
							:disabled="scope.row.isStatusLoading"
							@change="onStateChange(scope.row)"
						/>
					</template>
				</el-table-column>
				<el-table-column prop="price" label="操作" align="center">
					<template slot-scope="scope">
						<el-button
							type="text"
							@click="
								$router.push({
									name: 'course-edit',
									params: {
										courseId: scope.row.id,
									},
								})
							"
							>编辑</el-button>
						<el-button
							type="text"
							@click="
								$router.push({
									name: 'course-section',
									params: {
										courseId: scope.row.id,
									},
								})
							"
							>内容管理</el-button>
					</template>
				</el-table-column>
			</el-table>
			<el-pagination
				background
				layout="prev, pager, next"
				:total="totalCount"
				:page-size="filterParams.pageSize"
				:disabled="loading"
				@current-change="handleCurrentChange"
			/>
		</el-card>
	</div>
</template>

<script lang="ts">
import Vue from 'vue'
import { getQueryCourses, changeState } from '@/services/course'
import { Form } from 'element-ui'

export default Vue.extend({
  name: 'CourseList',
  data () {
    return {
      filterParams: {
        currentPage: 1,
        pageSize: 20,
        courseName: '',
        status: ''
      },
      courses: [],
      totalCount: 0,
      loading: true
    }
  },

  created () {
    this.loadCourses()
  },

  methods: {
    async loadCourses () {
      this.loading = true
      const { data } = await getQueryCourses(this.filterParams)
      data.data.records.forEach((item: any) => {
        item.isStatusLoading = false
      })
      this.courses = data.data.records
      this.totalCount = data.data.total
      this.loading = false
    },

    handleCurrentChange (page: number) {
      this.filterParams.currentPage = page
      this.loadCourses()
    },

    handleFilter () {
      this.filterParams.currentPage = 1
      this.loadCourses()
    },

    handleReset () {
      (this.$refs.form as Form).resetFields()
      this.filterParams.currentPage = 1
      this.loadCourses()
    },

    async onStateChange (course: any) {
      course.isStatusLoading = true
      await changeState({
        courseId: course.id,
        status: course.status
      })
      this.$message.success(`${course.status === 0 ? '下架' : '上架'}成功`)
      course.isStatusLoading = false
    }
  }
})
</script>

<style lang="scss" scoped>
.el-card {
	margin-bottom: 20px;
}
</style>
